Improved press for forming dies



l UNITED STATES WAX HENRY STEIN,

PATENT OFFICE.

OE NEW YORK, N. Y.

IMPROVED PRESS FOR FORMING DIES.

Specificatim forming part of Letters Patent No. 38,767, dated June 2,1863; antedated April 9, 1863.

To all whom it may concern:

Beit known that I, MAx HENRY STEIN, of the city, county, and State ofNew York, have invented a new and Improved Press for Forming Dies, doc.;and I do hereby declare the following to be a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming a part of this specification, in which- Figure lrepresents a longitudinal vertical section of my invention. Fig. 2 is atransverse vertical section of the same, taken in the plane indicated bythe line m Fig. 1.

Similar letters of reference in both views indicate corresponding parts.

The object of this invention is to produce dies of an alloy of copperand tin by subjecting said alloy, when in a red-hot state, to a suitablepressure, as fully described in Letters Patent granted to J. J. C.Smith, September 20, 1859, and reissued April l0, 1860. j

According to the description given in said Letters Patent, the die isiirst cast in the proper from, and when cold it is provided with an ironcollar, and, together with the matrix, reheated in an oven made andprovided expressly for this purpose, and then pressed from one side. Theuse of the iron collars causes much expense, because they are liable tocrack after having been used for the second time 5 and, furthermore, inreheatin g the die surrounded by the collar, and together with thematrix, the following serious difficulties arise: In the first place, itis impossible to decide about the proper heat of the die by theappearance of the red-hot collar, the die being made of copper and Jtinand the collar of iron; and, secondly, the matrix which has to producethe impression of the die is liable to become damaged, for whenever themetal on the surface of the die becomes a little too hot the matrixadheres to it, notwithstanding the use of lamp-black during theoperation of pressing, so that the two cannot be separated, and thematrix is lost. Furthermore, by pressing from one side only, the deepportions appear clear and sharp in the die, but particularly with moredifficult subjects the edges become rounded, almost Without exception,and it is generally necessary to heat and press the die more than once.These difficulties I have remedied by my invention, which consists inthe arrangement of two hingedlevers acting on a vertically-slidingplunger and acted upon by adjustable slides guided by grooves in theinner side of the frame of the press, in combination with two ,armsprojecting from the main or upper follower and acting on the adjustableslides, and with an adjustable pressbox, in such a manner that the metalor alloy in the press-box can be subjected simultaneously to a pressurefrom top and bottom, while at the same time the press-box prevents themetal spreading, and consequently produces a clear and distinctimpression on a die of the desired shape and size.

To enable those skilled in the art to make and use my invention, I willproceed to de. scribe its construction and operatlon with reference tothe drawings.

The frame A of my press consists of a Q- shaped casting, which risesfrom a table or bedplate, B. The central portion of said frame forms thenut for the screw C and sockets for two guide-rods, a, and its upper endor head forms a square, b, to receive the hand lever E', which serves tooperate the press. The lower end of screw C is fitted into the followerD in such a manner that the screw is permitted to turn freely, at thesaine time causing the follower to rise and fall, according 'to thedirection in which the screw is turned.

The follower is guided in its up-and-down motion and prevented fromturning by two arms, c, the ends of which catch into guidegrooves d inthe inner sides of the frame A. As the follower descends,it comes incontact with bars e, that are inserted into the grooves d, and whichrest on the outer ends of levers E. These levers are connected to thebedplate B by means of pivots or screwsf, ing through brackets g, whichproject from tn under side of said platform, and their innerl ends arepivoted to the shank of a plunger, F, so that by depressing thc outerends ot' said levers the plunger is forced up, and by raising the outerends of said levers or permitting them to rise, the plunger is made todescend.

The plunger F passes up through a hole in the bed-plate B, and it actsupon the under side of the' secondary follower Gr, so that by depressingthe main follower D said secondary follower is raised, and the substanceor material which may be placed between these two followers is pressedsimultaneously fromV top and bottom. It is obvious that by increasing ordecreasing the length of the bars e the action ofthe secondary followercan be made to commence sooner or later, as may be desired.

The secondary follower Gis precisely of the same size with a plate,D,which is secured to the under side of the main follower D by means ofa movable pin, h, and both the plate D and secondary follower G titexactly into the pressbox H. This press-box consists of four (more orless) flat or curved plates, c', that are kept up to the sides of thefollowers by means of setscrews j, and if the press-box is to be squareor polygonal it will be easily seen that by the same plates, z', boxesof different size can be produced 5 butif the press-box is to becircular or composed of curved plates the same sections will produceonly one size box, and for different sizes of boxes different plates orsections have to be kept on hand. Itis obvious that for dierent sizeboxes the secondary follower G and the plate D have to be changed.

The operation is as follows: The pressbox H is adjusted to suit the sizeof the die to be produced, and the plate D and follower G are selectedto match. The follower D is now raised and the alloy is fused and pouredinto the press-box H, and the matrix or design to be produced by thedie, which has been previously fastened to the under side of the plateDl and heated, is pressed into the alloy after the same has attained theconsistency of beeswax, which is the case when its temperature isreduced to the proper point, as described in the Letters Patent of J. J.G. Smith referred to above. By forcing the plate D down the secondaryfollower rises, and the metal in the box H is pressed simultaneouslyfrom both sides. By increasing or decreasing the length of the bars ethe pressure exerted by the secondary follower, as compared to thatexerted by the main follower, can be regulated at pleasure, so that thesubstance to be pressed can be subjected to a pressure of one, two, andfour inches from below, or vice versa.

By this arrangement a clear and distinct impression can be taken of themost difficult matrixes or patterns by one operation, and the press canbe adjusted to turn out dies of from one to twelve inches wide and froma quarter to three inches high.

What I claim as new, and desire to secure by Letters Patent, is-

rllhe arrangement of two hinged levers, E

E, plunger F, and bars e, in combination with the main follower D and anadjustable pressbox, H, constructed and operating substantially in themanner and for the purpose shown and described herein.

R. GAWLEY, EDW. W. IiloDGsoN.

